GE LPS-D, Instruction Manual, Page: 208 / 436

6-
6
LPS-D Line Protection System GE Power Management
6.3 MEASURING UNIT TESTS 6 FUNCTIONAL TESTS (USER SETTINGS)
6
6.3 MEASURING UNIT TESTS 6.3.1 WARNING
The A1 contact will chatter when the unit under test is near its threshold. Do not allow this to
continue. Remove the test current. A single contact closure is enough to determine that the
unit has picked up.
At the start of each test is an area to record your specific setting for the function under test.
6.3.2 T5 – I
T
TRIP SUPERVISION TEST
1. Protection Settings:
CURSUPVISN
(501) IT_PICKUP = [_________] amps,
where I
T
is set as follows:
I
T
= I
A
, I
B
, or I
C
(eq. 6–1)
The test current, I
op
, is single-phase and applied to I
A
. The LPS-D should pick up when I
op
is equal to I
T
.
2. Connect the relay as shown in Figure 4–3: PHASE TO GROUND TEST CONNECTIONS on page 4–14.
3. Set the relay into test mode 34 (IT Detector). The LUI display contains
IT DETECTOR ON
4. Set the level of I
op
to I
T
+ 0.1 = [_________] amps rms and apply to the relay. The A1 contact should close.
Lower I
op
to I
T
– 0.1 = [_________] amps rms; the A1 contact should open.
5. Reduce I
op
to zero.
6.3.3 T6 – I
B
BLOCKING SUPERVISION TEST (BLOCKING SCHEMES)
1. Protection Settings:
Z2 DISTANCE
(205) Z2GRDCHAR = GDOC
CURVSUPVIS
(502) IB_PICKUP = [_________] amps,
SCHEME
(1201) PICKSCHEME = BLOCK
where I
T
is set as follows:
, or I
C
(eq. 6–2)
The test current, I
op
, is single-phase and applied to I
A
. The LPS-D should pick up when I
op
is equal to I
B
.
2. Connect the relay as shown in Figure 4–3: PHASE TO GROUND TEST CONNECTIONS on page 4–14.
3. Set the relay into test mode 35 ( I
B
Detector). The LUI display contains
IB DETECTOR ON
4. Set the level of I
op
to I
B
+ 0.1 = [_________] amps rms and apply to the relay. The A1 contact should close.
Lower I
op
to I
B
– 0.1 = [_________] amps rms; the A1 contact should open.
5. Reduce I
op
to zero.
CAUTION
I
T
I
A
I
B
,
=